Cutter for pencil-sharpeners.



A. Pi WILSON.

CUTTER FOR PENCIL SHARPENERS.

APPLICATION FILED AUG.23. I911.

Patented A151. 22, 1919 Fidgl.

Iii/080M707 maroon srarns PATENT ALLEN P. WILSON, 0F WESTON, MASSACHUSETTS, ASSIGNOR TO BOSTON PENCIL POINTER COMPANY, OF WALTHAM, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

CUTTER FOR PENCIL-SHARPENERS.

neonate.

Specification of Letters Patent.

Patented Apr. 22, 19119.

A Application filed August 23, 1917. Serial No. 187,800.

To all whom it may concern:

Be it'known that'I, ALLEN P. WILSON, a citizen of the United States, and resident of Weston, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Cutters tor Penoil-Sharpeners, of which the following 1s a specification. I

This invention relates to cutters for pencil sharpeners, with the object in view of providing a hollow cutter which is developed from sheet metal.

Another object is to provide a cutter of this character which will have one or more exterior cutting edges developed thereon.

Another object is to provide acutter of this character which will have one of its ends developed into a driving element and a bearing for a shaft, while the other end is arranged to receive a cap having a bearing to support that end.

A still further object is to provide certain improvements inthe form, construction and arrangement of the elements forming the cutter whereby the above mentioned and other objects may be effectively carried out.

A practical embodiment of my invention is represented in the accompanying drawings in which,

Figure 1 represents a plan view of a disk of sheet metal from which my cutter is developed.

Fig. 2 represents an edge view of the same.

Fig. 3 represents a side view of one stage of development of the cutter.

Fig. 4 represents a longitudinal central section of the same.

Fig. 5 represents a side View of the same showing a driving element developed therein.

Fig. 6 represents an end view of the same.

Fig. 7 represents a longitudinal central section of the same.

Fig. 8 represents a similar view showing the inwardly turned flange formed in the reduced end.

Fig. 9 represents an end view of the same.

Fig. 10 represents a side view of the body of the cutter having straight cutting edges formed therein.

Fig. 11 represents an end View of the same.

Fig. 12 represents a horizontal section taken in the plane of the line XIIXII of F ig. 10, looking in the direction of the arrows.

Fig. 13 represents a plan view of the cap and bearing for the open end of the body of the cutter.

Fig. 14 represents a central through the same and Fig. 15 represents a longitudinal central section of the body and cap assembled.

The cutter as a whole comprises a hollow body 1, shown cylindrical in the present instance, having a reduced end 2 integral therewith and a separate cap 3 for the other end. The body has formed thereon one or more straight cutting edges 4 which extend lengthwise throughout the exterior surface to within a slight distance of the open end, leaving a plain surface 5 for the reception of the cap 3. Between the end 2 and the cut ting edges 4, there is formed on the body a driving element 6. In the present instance a gear is shown. The end 2 is provided with an inwardly turned annular flange 7 which forms a bearing for one end of the body of the cutter when mounted for use.

The cap 3 has a peripheral rim 8 which is adapted to snugly engage the plain surface 5 of the hollow body 1, and an inwardly turned annular flange 9 which forms a hearing for that end of the body.

The several stages of development through which the disk 10 is passed to complete the cutter body are shown in Figs. 1 to 11 inclusive, all of which operations are accomplished by suitable developing means such as drawing, rolling, stamping and punching devices of any well known or approved type. It will be understood by those skilled in the art, that to develop the hollow body shown in Figs. 3 and 4, it may be necessary to pass the blank through several similar drawing operations, each step advancing the blank until the desired form is obtained.

The first stage of development is shown in Figs. 1 to 4 inclusive, in which the disk 10 is brought to a hollow body. The second stage of development is shown in Figs. 5 to 7 inclusive, in which the driving element is formed on the reduced end of the hollow body. The third stage of development is shown in Figs. 8 and 9, in which the hole is punched in the reduced end and the walls section turned inwardly to form the hub or bearing at that end. The fourth stage of development is shown in Figs. 10 and 11, in Which the cutting edges are formed on the body by a distortion of the Walls of the body.

The cap 3 may be formed by a suitable punching and forming device of any Well known or approved type.

*The rim 8 of the cap is made to fit frictionally tight on the plain surface 5 and thereby obviate any further means of fastening between the cap and body.

It is to be understood that after the above operations are completed, the parts may be suitably hardened by any Well known or approved method and if desired, suitably sharpened.

It is also to be understood that where the term gear is used in the specification and claims, I intend to cover any equivalent element.

What I claim is:

1. A cutter for pencil sharpeners comprising a tube having its side walls distorted but unbroken to form one or more straight exterior pencil sharpening ribs of greater length than Width.

2. A cutter for pencil sharpeners comprising a tube having its side Walls distorted but unbroken to form one or more continuous straight exterior pencil sharpening ribs of greater length than Width.

3. A cutter for pencil sharpeners comprising a tube having one end developed into a gear, the side Walls of the tube being distorted to form one or more straight exterior pencil sharpening ribs of greater length than Width.

4. A cutter for pencil sharpeners comprising a tube having one end developed into a driving element, the side Walls of the tube being distorted but unbroken to form one or more straight exterior pencil sharpening ribs of greater length than Width.

5. A cutter for pencil sharpeners comprising a tube havingoneenddeveloped into a shaft bearing, the side Walls of the tube being distorted to form oneorimore straight exterior pencil sharpening ribs of greater length than Width and a member fitted to the other end of the tube developed into a second shaft bearing.

6. A cutter for pencil sharpeners comprising a tube having one end developed into a shaft bearing, the side NViLllS of the tube being distorted but unbroken to form one or more straight exterior pencil sharpening ribs of greater length than width and a member fitted to the other end of the tube developed into-a second shaft bearing.

7 A cutter for pencil sharpeners comprising a tube having one end developed into a gear and a shaft bearing, the side Walls of the tube being distorted to form one or more straight exterior ribs of greater length than Width for sharpening the pencil and a member fitted to the other end of the tube developed into a second shaft bearing.

8. A cutter for pencil sharpeners comprising a tube havingone end developed into a driving elementand a shaft bearing the side Walls of the tube being distorted but unbroken to form one or more straight exterior ribs of greater length than Width for sharpening the pencil and a member fitted to the other end of the tube developed into a second shaft bearing.

In testimony, that I claim the foregoing as my inventiom'I have signed my name this 4th day of August, 1917.

ALLEN R'WILSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner otratents, Washington, D. G. 

